On Wed, Jun 23, 2010 at 05:08:40PM -0400, Martin Langhoff wrote: > you've mentioned some interesting details to our writes-to-SD-are-slow > issues. Do we have a good scripted test that is current to the problem > (as we understand it today)?
My calculations were based on an invalid assumption so I'll have to retest. Here's some ideas though: 1. start with an empty journal, cover the camera lens, use Record to take lots of photographs (the O game key is faster than clicking the UI), then Alt/Tab to the journal, then measure the time it takes for all the photographs to arrive, 2. in the Terminal activity create a script that writes 500Mb of data to a file, then waits for the writes to finish: cat << EOF > write-500mb #!/bin/sh dd if=/dev/zero of=file bs=1024k count=500 sync EOF chmod +x write-500mb time write-500mb rm -f file 3. as a baseline, using OpenFirmware, reflash the same laptop using fs-update, measuring the time taken (it is displayed after fs-update finishes), and calculate a rate based on number of blocks shown. -- James Cameron http://quozl.linux.org.au/ _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel